A block of mass \( 0.9 \mathrm{~kg} \) attached to a spring of force constant \( K \) is compres...

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A block of mass \( 0.9 \mathrm{~kg} \) attached to a spring of force constant \( K \) is compressed by \( \sqrt{2} \mathrm{~cm} \) and the block is at a distance \( 1 / \sqrt{2} \mathrm{~cm} \) from the wall as shown in figure-5.160. When the block is released, it makes elastic collision with the wall and its period of motion is \( 0.2 \mathrm{~s} \). Find the value of \( K \).
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